微机控制高频脉冲列实现晶闸管“双窄脉冲触发”的研究与应用  

Research and application for realizing thyristor trigger using "double narrow pulse" by microcomputer controlled high-frequency pulse train

作　　者：刘觉民[1] 付义[1] 鲁文军[1] 李亚萍[2] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]国家继电保护及自动化设备质量监督检验中心,河南许昌461000

出　　处：《电工电能新技术》2012年第1期79-83,共5页Advanced Technology of Electrical Engineering and Energy

基　　金："中央高校基本科研业务费"能力培养类项目(2009);湖南省科技计划项目(2010CK3016);湖南省高校重点实验室开放基金资助项目(2009)

摘　　要：提出了运用冲量定理分析高频脉冲列取代宽触发脉冲的机理;建立了励磁回路和晶闸管触发回路等效数学模型;推导出感性负载时,由晶闸管开通时间、擎住电流、励磁回路与触发回路参数,计算晶闸管触发脉冲宽度和高频脉冲列周期与脉宽的数学表达式;根据计算值设计的微机励磁系统高频脉冲列触发程序应用于LM-01型微机励磁系统样机并进行了动态模拟试验,测试波形和试验数据表明,各高频脉冲列和励磁电压波形对称性和稳定性好,触发精度高,励磁电压连续可调,达到感性负载条件下晶闸管三相可控整流桥"双窄脉冲触发"的要求,证明了该理论分析与计算方法的正确性和可行性。A method using high-frequency pulse train to replace the wide triggering pulse by using impulse analysis theory is proposed in the paper.Firstly,a mathematical model of excitation circuit and thyristor triggering circuit is established,and the expressions for calculating the thyristor triggering pulse width and the pulse period and pulse width of high frequency pulse train based on the thyristor conducting time,latching current,and parameters of excitation and triggering circuits with the inductive load are deducted.The program of high frequency pulse train for the microcomputer controlled excitation system based on the calculated results is used in LM-01 system and a dynamic simulation test is carried out.The test waveform and data indicate that the proposed method gives good symmetry,stability and high precision,and the excitation voltage is continuously adjustable,achieving the requirements for the three phase controlled thyristor rectifier bridge ＂double-narrow pulse triggering＂ at inductive load.It proves that the analysis method and the calculations are correct and feasible.

关 键 词：高频脉冲列 冲量定理 脉冲变压器 双窄脉冲触发 感性负载 

分 类 号：TM76[电气工程—电力系统及自动化]